waecE-LEARNING
Physics Paper 2, Nov/Dec. 2011  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength
















Question

(a) What is electrolysis?
(b)  A current of 2A is passed through a copper voltameter for 5 minutes.
     Determine the mass of the copper deposited.
     [Electrochemical equivalent of copper = 3.27 x 10-7 kg C-1]

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comments

 This was another popular question among the candidates and was fairly well attempted.  Some candidates however, lost marks for using wrong terminologies.  Examples instead of decomposition some candidates used dissociation or disassociation.  Instead of electrolytes some candidates used substances.
The expected answers are:                    
  (a)     Electrolysis is the  process  by which a solution or a molten substance is broken
           down into its component parts by the passage of (a direct) electric current/electricity.

 (b)    Mass of copper deposited   =   zIt
                                                           =   3.27 x 10-7 x 2 x 5 x 60
                                                           =   1.962 x 10 -4 kg.

 


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